Compression pump



'1. lvl.Y IEWELL'.' v COMPRESSION PUMP. APPLICATION FILED MAR. 26, 1920.

Patented Apr, 25, 1922,

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UNITED STATES-'PATENT F-FICE.-

JAMES M. JEWELI., or DETROIT., MICHIGAN, AssIeNoa or?. ONE- HALE To oIIAELEsfE.

WEYANDT, or DETROIT, MICHIGAN.

' ooMrREssIoN IUMP.' Y

Application led Vli/[arch 26, 1920. Serial No. 368,851.

' To all whom t may concern:

V`certain other matters hereinafter set forth much smaller scale.

Be it known that I, JAMES M. JEwELL, a citizen of the United Statesof America, residing 'at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful improvements iu Compression Pumps, of which the following is a ple-in construction and efficient in operation; .r A further object is to provide certain other new and useful features, allfas hereinafter moreV fully described.

With the above andotherobjects in'view, the invention consistsf'in providing a plurality of connected movable 'cylinders and stationary pistons thereimwhereby a stage `compression of fluid is effectedland a si'm- L,

ple, compact, and efiicient'arrangement secured. The invention further consists in and; more particularly pointed out in the appended claims, reference being had to the accompanying drawing lin whichi Fig. 1 is a vertical section through a device illustrative of the invention, and

I Fig. 2 a plan view of the same drawn to-a In the drawing, 1 indicates a suitable base from which rises a tubular member 2 forrning aistationary piston'adapted to fit within a movable sleeve member 3 forming a cylinder, the piston 2 being preferably encased with a tubular shell 4 which is of such diarneter as to leave'a space 5 around the' pisc Atonlfor the cylinder Sto slide freely therein.

The lower end4 ofthe hollow piston 2 is fixed beror cylinder 21 which is rigidlysecured Y to the base 1 in any suitable mannerasby screw-threading said endeXternally to engageV an'inte'rnallyscrew=threaded boss 6 on thebase, which base is vformed with an outlet passage 7I communicating `with the interior of the hollow piston.` An outwardly opening valve 8 controls'the outlet from the piston into said passage and asuitable nipple A 9V or other suitable means may be providedy on the basefor th'eoutletjendfof the passage .for the attachment of a yhose` (not shown) or other `means for conducting the lcompressed lfluid awayL-rlliecupper end ofthe v Specification of Letters Patent. l

Patented npr. 25, '1922'.

piston is closed by an end wall or head 10 having anvopening or passage 1l therein af fording communicationofthe interior ofthe cylinder 3 .with the interior ofthe piston 2 and this passage is controlled by avsuitable check valve l*12 for checking'the air orfluid -from the cylinder into the piston.. lAny suitable means may be provided for'making a tight jointv between` cylinder/and piston and prevent leakage around the piston from the cylinder into the VV,space-5, the-means shown comprising a cupped washer13securedl to the head 10 with the free upstandling edgel ofV the washer resting against the interior surface ofthe cylinder.V lf found desirable, a suitable nut or pac-king. gland. 141: may be provided upon theupper end of ,the

and to assist ign-guiding the?v cylinder :inv its lshell 4 to formga tight jointgbetween the ,shell vand exterior ofthe movable cylinder A reciprocating'movement upon the fixed 'piston 2. Y

The upper-end of thek cylinderl 3 is closed by a suitable head 15 having an axial. inlet passage 16 therethrough vfor ladmitting air-5.l -to the upper end ofthe cylinder, said passoVA sage .being controlled by a suitablefcheck valve 17 for checking the air A"into the cylin-V der, and this head or closuregl may have ,laterallyV extendingarms. 18 `provided, with openings through which guide,` rods 19 eX- -tend, said closure 15 and arms 18fformingr cross head to guide the upper end of the cylindenthe guide rods 19 being rigidly secured at their` lower ends vto the base lin any suit-able manner and extending parallel j with the axisof the cylinderat each 'side thereof. Attheir extreme upper` ends, these guide rods 'are rigidly connected together by l i .95. v rigid vertical guide for theupper ven dk of` a. cap 20, the rodsfand cap` thus -makinga the Vcylinder 3 and forfa second tubular memat' its lower end in-any s uitablemanner `to the crossehead, as by providing `an exter;`- nally 'screw-threaded boss 22 on 'thefupper side [ofVA the cross .head in axial alignment with the cylinder 3 to receive the internallyy thereon and the upperfend of' this 'piston-22 is securedinany Asuitable manner to the cap, as byproviding an externally vscrew-thread-1= therein for the escape ofair into the cylin-Y der 21, a suitable 'check valve 2"? being provided to control said passage and permit the free passage orp air from the hollow piston into the cylinder but efcctually closing the passage against the escape of air flier-ethrough'from the cylinder' into the piston upon an upward movement of the cylinder lso , the check `'valve 27, will `be forced' through which is reciprocated with Athe'crossi-heard andcylinder- ATo prevent leakage around the .piston 22 between it and the inner siii"- face of the cylinder 21, a cupped washer 28 similar to the yviiisher 1B shown as secured'to the head 25. Y

vrllnclosing the cylinder 21 is a tubular shell or casing 28 which is secured in any suitablermanner at'its upper end to the cap 2O and is of such diameter to provide a spa-ce 29 between it and the piston 22, within which space the cylinder 21 reciprocates. lf found desirable a suitable packing` gland or nut 30 may be secured upon the lower end of this tubular shell to make a tight joint between it and the cylinder 21 and to guide the ,cyl-r inder in its reciprocating movement.

The cross head may be movedralong the guide rods 19 by the application of power fthereto in any suitable manner, the means shown being a handle 81 extending laterally from each end of the cross head, which handles maybe grasped by theoperator to reciprocate the cross-head and cylinders 3 and 21 carried thereby. v J Y i When thisdevice is used a hand pump for pumping air into tires et motor vehicles,

or for likeY purposes, the operator will lgrasp the handles 31 and reciprocate the cylinders 3 and 21 in'th'at manner, but; it will be understood that thedevice may be made in any desired size and operated by power.

Upon downward movement of the crosshead' and cylinders carried thereby, air will be drawn into the hollow piston 22 through the opening 24 inthe cap 20 and pass out ofV the vlower end thereof through the pas- 4sage 26 past the check valve 27, into the inte- 'rior ofV the cylinder 21. Upon upward movement of the cross-head Vand cylinders, the vair trappedv within the 'cylinder .21,by

'the' passage 16 past the' check valfve'17 into the 'cylinder 3 which is of less diameter and lc'onsfe'que'ntly less capacity than the cylinder 21 and will7 therefore, be compressed. Upon the next down stroke of the cross'head, the

ai'r trapped inthe cylinder 3 by the che'clr valv'e`17, will be forced 'out through the' pasfr as "sagell past the 'check valve 12 into the tubular 'piston 2'which is of less diameter The air is thus forcedv from a larger into Y a smaller chamber at each stage'of its pas'- k sagethrough the pump' and a stage7 com Vpression is therefore secured, giving a very high compression at the'dis'charge end of the pump in proportion lto' the power required to reciprocate the parts. The arrangement of aligned movable cylinders and fixed hollow pistons provides a compact and eflicient arrangement and by providing the tubular shell l and 28 enclosing the pistons,

cooling of they cylinders is'effected by the forced circulation of air, whichair is 'drawn into the spaces 5 and -29 fand Vexpelled the-refrom. through outlets 32 provided in the Y'shells adjacent'tlie fixed endsthereof.k

Obviously, changes maybe madefin the and proportion ofthe several cylinders,

and the particular construction and'arrangement of crossfhead and guides may be varied to sint the conditions of use within the scope 'of the appended claims without departing fromv thespirit ofthe 'invention and othery changes may be made in the construction and arrangement of parts shown.

"Having thus fully described my invention, what Iclaim is: f v l. A stage 'compression pump comprising a' base, a vertical tubular piston fixed on ythe base,- a tubular cylinderslidable on said piston, a second piston fixed in longitudinal axial alignment with/said first piston and spaced therefrom, a second tubular cylinder of greater capacity than said first cylinder an d slid able upon said second piston, 4a crosshead connecting the adjacentfends of said cylinders, said cross head having' a passage connecting said cylinders and said first pis-v ton being arranged to receive fluid from said first cylinder, a check valve controlling the passage Yin said crossv headan'd permitting flow of fluid from said second'tosaid Lfirst cylinder yin that direction only, and a check valve permitting flow Vof fluid from said first cylinder into said first piston in that direction only. v

2. ,A stagecompress'ion pump comprising ahase, a tubularpiston 'fixed on theV base and havinganinl'et at itsiippe'i` end andan outlet at its lower end, vertical guide rods fixedat'one end-'tothe baseat each side of thesaid'fixedl piston, a head carried'rby the upper ends of 'saidA rods and connecting Vthe same,- a second piston fixed at its upper end to said head .in longitudinalaxial alignment with said first pistonya cross-head reciprocabl'e 'up'nsaid rods betweenV the adjacent end'sof said pistons, tubular eyli'nilo iso

ders Xed to opposite sides of said cross head and sleeved upon said pistons to re- Vtheir lower ends tothe base and extending ciprocate thereon, one of said cylinders lbeingof greater capacity than the other and being `1n communication at their adJacent ends; a check valve controlling communication between said cylinders and permitting low from the cylinder of larger capacity into the cylinder of lesser capacity only,

and check valves forythe inlet and outlet upward at each side of the piston and casing, a head connecting` the upper ends of said rods, a tubular lpiston secured at its upper end to the head and having a head at its lower end provided with an outlet,

a tubular casing surrounding said piston and spaced therefrom and secured at` its upper end to the lieadtowhicli the piston is attached, across-head reciprocable'upon said rods `between the l.adjacent ends of -the pistons, cylinders rsecured at adjacent ends toi opposite sides of said cross head and adapted to slideupon said pistons within the` spaces between the pistons and casings, one of said cylinders being of greater diameter than the other and said pistons beingy of diameters to` ,lit within said cylinders, said cross-head being provided with a passage affording communication between said cylinders, means for reciprocating the cross-head and attached cylindersand check valves for the passage connectingfthe cylinders, theoutlet for the second piston into'tlie `pper cylinder andv f the'inlet into the lower piston. In testimony whereof I aiix my signature in the presence of two witnesses.

Witnesses:

LEwIs E. FLANDERS, ANNA M. DoRR.

fro.l 1

JAMES. M. JEwELIQQ 

